System, method, and article of manufacture for a polymorphic exception handler in environment services patterns

1. A method for minimizing the amount of changes that need to be made to exception handling logic when new exceptions are added, comprising the steps of: (a) organizing exceptions into hierarchies in a polymorphic exception handler; (b) catching a root of one of the hierarchies in which an exception occurs; (c) instructing the exception to rethrow itself; (d) catching the rethrown exception; (e) identifying the rethrown exception; (f) determining a type of the rethrown exception; (g) outputting a message indicating the type of the rethrown exception; and (h) creating catch blocks to catch the rethrown exception.

2. A method as recited in claim 1 , wherein single exception interfaces are used as the roots of the hierarchies.

3. A method as recited in claim 1 , wherein the polymorphic exception handler handles each unique root.

4. A method as recited in claim 1 , wherein an added exception is organized into a hierarchy and handled by the polymorphic exception handler.

5. A method as recited in claim 1 , wherein handling behavior is encapsulated in the polymorphic exception handler.

6. A computer program embodied on a computer readable medium for minimizing the amount of changes that need to be made to exception handling logic when new exceptions are added, comprising: (a) a code segment that organizes exceptions into hierarchies in a polymorphic exception handler; (b) a code segment that catches a root of one of the hierarchies in which an exception occurs; (c) a code segment that instructs the exception to rethrow itself; (d) a code segment that catches the rethrown exception; (e) a code segment that identifies the rethrown exception; (f) a code segment that determines a type of the rethrown exception; (g) a code segment that outputs a message indicating the type of the rethrown exception; and (h) a code segment that creates catch blocks to catch the rethrown exception.

7. A computer program as recited in claim 6 , wherein single exception interfaces are used as the roots of the hierarchies.

8. A computer program as recited in claim 6 , wherein the polymorphic exception handler handles each unique root.

9. A computer program as recited in claim 6 , wherein an added exception is organized into a hierarchy and handled by the polymorphic exception handler.

10. A computer program as recited in claim 6 , wherein handling behavior is encapsulated in the polymorphic exception handler.

11. A system for minimizing the amount of changes that need to be made to exception handling logic when new exceptions are added, comprising: (a) logic that organizes exceptions into hierarchies in a polymorphic exception handler; (b) logic that catches a root of one of the hierarchies in which an exception occurs; (c) logic that instructs the exception to rethrow itself; (d) logic that catches the rethrown exception; (e) logic that identifies the rethrown exception; (f) logic that determines a type of the rethrown exception; (g) logic that outputs a message indicating the type of the rethrown exception; and (h) logic that creates catch blocks to catch the rethrown exception.

12. A system as recited in claim 11 , wherein single exception interfaces are used as the roots of the hierarchies.

13. A system as recited in claim 11 , wherein the polymorphic exception handler handles each unique root.

14. A system as recited in claim 11 , wherein an added exception is organized into a hierarchy and handled by the polymorphic exception handler.

15. A system as recited in claim 11 , wherein handling behavior is encapsulated in the polymorphic exception handler.